[WWcvs] pg: count {\rm } as a blank string

[dpvc v. a. <we...@ma...>]

Log Message:
-----------
count {\rm } as a blank string

Modified Files:
--------------
    pg/macros:
        parserMultiAnswer.pl

Revision Data
-------------
Index: parserMultiAnswer.pl
===================================================================
RCS file: /webwork/cvs/system/pg/macros/parserMultiAnswer.pl,v
retrieving revision 1.11
retrieving revision 1.12
diff -Lmacros/parserMultiAnswer.pl -Lmacros/parserMultiAnswer.pl -u -r1.11 -r1.12
--- macros/parserMultiAnswer.pl
+++ macros/parserMultiAnswer.pl
@@ -314,7 +314,7 @@
 #
 sub check_string {
   my $s = shift;
-  $s = shift unless defined($s) && $s =~ m/\S/;
+  $s = shift unless defined($s) && $s =~ m/\S/ && $s ne '{\rm }';
   return $s;
 }